Modeling the frequency-domain ringdown amplitude of comparable-mass mergers with greybody factors
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917489870372864 |
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| author | Rosato, Romeo Felice Yi, Sophia Berti, Emanuele Pani, Paolo |
| author_facet | Rosato, Romeo Felice Yi, Sophia Berti, Emanuele Pani, Paolo |
| contents | It was recently shown that, in a binary coalescence, the greybody factor of the remnant black hole modulates the post-merger ringdown signal. In this work, we demonstrate that a simple four-parameter model based on the greybody factor accurately reproduces the frequency-domain amplitude of a large set of comparable-mass, aligned-spin numerical relativity waveforms from the SXS catalog, achieving mismatches of order ${\cal O}(10^{-5})$ and improving existing models by roughly two orders of magnitude. We also identify the optimal initial frequency for applying the model in the frequency domain and provide analytical fits of the model parameters in terms of the progenitor masses and aligned spins. Our results pave the way for new consistency tests of the ringdown phase, complementary to traditional black hole spectroscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_15877 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modeling the frequency-domain ringdown amplitude of comparable-mass mergers with greybody factors Rosato, Romeo Felice Yi, Sophia Berti, Emanuele Pani, Paolo General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Phenomenology It was recently shown that, in a binary coalescence, the greybody factor of the remnant black hole modulates the post-merger ringdown signal. In this work, we demonstrate that a simple four-parameter model based on the greybody factor accurately reproduces the frequency-domain amplitude of a large set of comparable-mass, aligned-spin numerical relativity waveforms from the SXS catalog, achieving mismatches of order ${\cal O}(10^{-5})$ and improving existing models by roughly two orders of magnitude. We also identify the optimal initial frequency for applying the model in the frequency domain and provide analytical fits of the model parameters in terms of the progenitor masses and aligned spins. Our results pave the way for new consistency tests of the ringdown phase, complementary to traditional black hole spectroscopy. |
| title | Modeling the frequency-domain ringdown amplitude of comparable-mass mergers with greybody factors |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.15877 |